I take it back! It IS libxml2.
I tried to copy a newer version of libxml (2.9.1 from Linux Mint 16) to my Debian Wheezy sigil install, but of course that won't work because of glibc dependencies that that Sigil executable can't meet. So just for laughs, I copied the older libxml2 library (v2.7.8) from my Mint 12 (Ubuntu 11.10) build machine, and lo and behold, the damn thing works! The doubling issue goes away!
Could the 2.8.0 version of libxml2 on Wheezy just be a buggy version?
It'd be no problem to include the older 2.7.8 version with the binary package (the LD_LIBRARY_PATH is already being set) ... but that won't help Wheezy users who might want to build Sigil on their own. Nor would I want to trump newer (and working) versions of libxml2 on newer systems.
Maybe I'll just create a separate, special binary package for Debian Stable and write Wheezy off as insufficient for building Sigil for now. Once Debian Stable moves beyond libxml2 v2.8.0, the problem may fix itself.
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